US20060042216A1 - Lawn mower - Google Patents
Lawn mower Download PDFInfo
- Publication number
- US20060042216A1 US20060042216A1 US11/216,391 US21639105A US2006042216A1 US 20060042216 A1 US20060042216 A1 US 20060042216A1 US 21639105 A US21639105 A US 21639105A US 2006042216 A1 US2006042216 A1 US 2006042216A1
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- United States
- Prior art keywords
- blade
- cutter
- cutter blade
- grass
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
- A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
- A01D34/73—Cutting apparatus
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/001—Accessories not otherwise provided for
- A01D34/005—Mulching means
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
- A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
- A01D34/82—Other details
- A01D34/826—Noise reduction means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S56/00—Harvesters
- Y10S56/17—Cutter details
Definitions
- This invention relates to a lawn mower having two cutter blades in a cutter housing.
- working modes of a lawn mower basically there are the three working modes of mulching work, bagging work, and discharge work.
- Mulching work is a working mode in which two cutter blades are provided in a cutter housing, grass is cut with these cutter blades, and finely cut grass cuttings are dispersed on the lawn surface after cutting so that they are inconspicuous.
- Bagging work is a working mode in which one cutter blade is provided in the cutter housing, grass is cut with this cutter blade, and the cut grass is received in a grass bag attached to the back of the cutter housing.
- Discharge work is a working mode in which one cutter blade is provided in the cutter housing, grass is cut with this cutter blade, and the cut grass is discharged onto the mown lawn surface from the rear of the cutter housing.
- a lawn mower made to perform mulching work is proposed in for example Japanese Utility Model Registration No. 2516509.
- the lawn mower 240 of related art shown in FIG. 13 has a motive power source 242 mounted on the top of a cutter housing 241 .
- An upper cutter blade 245 for mulching work only and a lower cutter blade 244 for bagging work and discharge work are attached one above the other to the output shaft 243 of the motive power source 242 .
- the lower cutter blade 244 and the upper cutter blade 245 are rotated inside the cutter housing 241 and cut grass.
- the upper cutter blade 245 is parallel with and stacked on the lower cutter blade 244 .
- the upper cutter blade 245 is positioned close to air-lifting parts 246 , 246 of the lower cutter blade 244 . Consequently, there has been the shortcoming that as a result of a swirl current and lift current creation function of the air-lifting parts 246 , 246 , which are for creating a carrying draft in the cutter housing 241 , being obstructed, as shown in FIG. 13 , the airflows in the vicinities of the air-lifting parts 246 , 246 are disrupted and there is a resulting increase in noise.
- the phases of the blade edges 247 , 247 of the lower cutter blade 244 and the blade edges 248 , 248 of the upper cutter blade 245 overlap. Because of this, it sometimes happens that when grass is cut by the upper cutter blade 245 , this grass is pushed over (made to lean) in front of the blade edges 248 , 248 , and this leaned grass is to be cut by the blade edges 247 , 247 of the lower cutter blade 244 , and the grass cannot be cut with certainty by the lower cutter blade 244 .
- the present invention provides a lawn mower having a cutter housing, a motive power source mounted on top of the cutter housing, a lower cutter blade attached rotatably inside the cutter housing and substantially horizontally to the end of the output shaft of the motive power source, and an upper cutter blade attached rotatably inside the cutter housing and substantially horizontally to the output shaft above the lower cutter blade, wherein the lower cutter blade has lower blade edge parts formed at its leading edges in the rotation direction for cutting grass and air-lifting parts for creating a swirl current and a lift current formed behind these lower blade edge parts, the upper cutter blade has upper blade edge parts formed at its leading edges in the rotation direction for cutting grass, and the upper blade edge parts are advanced in phase so that they are positioned forward in the rotation direction with respect to the lower blade edge parts.
- the upper and lower cutter blades are attached to the output shaft so that the upper blade edge parts are positioned forward of the lower blade edge parts in the rotation direction like this, interference of the upper cutter blade with the air-lifting parts of the lower cutter blade is avoided, and impairment of the swirl current and lift current creation function of the air-lifting parts is prevented. As a result, the noise produced by the rotation of the cutter blades is reduced.
- the rear edges of the air-lifting parts are formed wavily.
- the swirl current and lift current created by the air-lifting parts are made orderly and the grass can be held in an upright state so that it is easy to cut.
- the upper cutter blade is set to approximately the same height as the rear edges of the air-lifting parts. In this case, interference with the lower cutter blade can be avoided and the height dimension of the cutter housing can be kept to a minimum. As a result, the center of gravity position of the lawn mower can be maintained as noise is reduced.
- FIG. 1 is a perspective view of a lawn mower using upper and lower cutter blades according to the invention
- FIG. 2 is a side view of FIG. 1 ;
- FIG. 3 is a plan view of FIG. 1 ;
- FIG. 4 is a view in the direction of the arrow 4 in FIG. 1 ;
- FIG. 5 is a side view showing a mulching work state of the lawn mower shown in FIG. 1 ;
- FIG. 6 is a sectional view of a clutch mechanism shown in FIG. 2 ;
- FIG. 7A and FIG. 7B are views illustrating the operation of the clutch mechanism shown in FIG. 6 ;
- FIG. 8 is a plan view of a lower cutter blade according to the invention shown in FIG. 5 ;
- FIG. 9 is a plan view of an upper cutter blade according to the invention shown in FIG. 5 ;
- FIG. 10 is a plan view showing the upper and lower cutter blades shown in FIG. 8 and FIG. 9 in their mounted state;
- FIG. 11 is a partially sectional view of the upper and lower cutter blades mounted to the clutch mechanism
- FIG. 12 is a graph showing changes in noise level with changes in phase angle of upper and lower cutter blades according to the invention.
- FIG. 13 is a view showing part of a lawn mower of related art having upper and lower cutter blades.
- FIG. 14 is a plan view of the upper and lower cutter blades of related art shown in FIG. 13 .
- a lawn mower 10 constituting a preferred embodiment of the invention shown in FIG. 1 is of a self-propelling type.
- a cutter blade 14 for cutting grass is rotated by an engine 13 , which is a motive power source. Cut grass is collected by being carried from a cutter housing 12 by a carrying draft into a grass bag 24 .
- Rear wheels 17 are driven by the engine 13 .
- the reference number 11 denotes a machine body; 16 front wheels; 18 handle stays; 19 a handle; 21 a handle cover extending across the handle 19 ; 22 a clutch lever for travel, which clutch-controls motive power transmission from the engine 13 to the rear wheels 17 ; 23 a grass cover; 25 a clutch lever for clutch-controlling rotational power to the cutter blade 14 ; 26 a lock lever; 27 a head cover; and 60 a lock mechanism.
- the clutch lever 25 is a lever that simultaneously performs an operation of applying a brake to the cutter blade 14 while stopping the driving of the cutter blade 14 , and is sometimes called a BBC control lever because it controls a blade, a brake and a clutch.
- the engine 13 of the lawn mower 10 is mounted on the top of the cutter housing 12 .
- the cutter blade 14 is attached to the output shaft 28 of the engine 13 by way of a clutch mechanism 40 .
- the left and right front wheels 16 are disposed at side faces of the front part of the cutter housing 12
- the left and right rear wheels 17 are disposed at side faces of the rear part of the cutter housing 12 .
- Left and right handle stays 18 are attached to the side faces of the rear part of the cutter housing 12 .
- the handle 19 extends rearward from the rear parts of these handle stays 18 , 18 .
- the clutch lever 25 is mounted on this handle 19 and controls the clutch mechanism 40 .
- the lock lever 26 is mounted in front of the clutch lever 25 and bars an engaging function of the clutch lever.
- the grass bag 24 is removably attached to a rear wall 31 of the cutter housing 12 .
- a grass cover 23 is swingably attached to an upper part of the rear wall 31 of the cutter housing 12 .
- the grass bag 24 is made of a porous material having plural air holes (not shown) through which only the carrying draft can pass but grass cuttings cannot pass.
- the clutch mechanism 40 of the lawn mower 10 (see FIG. 2 ) is switched from an off state to an engaged state by a two-stage motion of shifting the clutch lever 25 to the handle 19 side and then shifting the lock lever 26 forward, to rotate the cutter blade 14 , and the clutch lever for travel 22 is shifted to the handle 19 side to rotate the rear wheels 17 , 17 .
- the cutter blade 14 has blade parts 38 , 38 on its leading sides in the rotation direction shown with the arrows A, A, and from these blade parts 38 , 38 on its trailing sides in the rotation direction it has air-lifting parts 39 , 39 formed so as to curve upward.
- FIG. 4 shows the underside of the lawn mower 10 .
- the cutter blade 14 is covered by the cutter housing 12 .
- the cut grass carrying passage 32 for guiding cut grass into the grass bag 24 (see FIG. 2 ) is formed in the cutter housing 12 . This cut grass carrying passage 32 connects with the grass bag 24 .
- the reference number 29 denotes a power-transmitting part (a belt); 33 a scroll part provided in the cutter housing 12 for rotatably receiving the cutter blade 14 ; 52 a drive pulley; 34 a clutch for travel; and 35 a rear wheel axle.
- the output of the engine 13 is transmitted from the drive pulley 52 of the output shaft 28 to a driven pulley 29 a by the belt 29 , and by way of the driven pulley 29 a and the clutch for travel 34 the output of the engine 13 is transmitted to the rear wheel axle 35 and drives the rear wheels 17 , 17 (see FIG. 3 ).
- FIG. 5 shows a mulching work state of the lawn mower.
- Mulching work (mulching mode) is a working mode in which two cutter blades are provided in the cutter housing, grass is cut with these cutter blades, and finely cut grass cuttings are dispersed on the lawn surface (ground surface) so that they are inconspicuous.
- Mulching work is an alternative mode of discharge work, discussed below.
- Discharge work is a working mode in which grass is cut with one cutter blade, and the cut grass is made to pass through the cut grass carrying passage and discharged outside through the grass cover.
- Bagging work is a working mode in which grass is cut with one cutter blade and the cut grass is made to pass through the cut grass carrying passage and collected in the grass bag.
- the lawn mower 10 of this preferred embodiment is capable of mulching work, discharge work and bagging work (see FIG. 2 ).
- an upper cutter blade 15 for mulching work is fitted to the output shaft 28 of the engine 13 along with a lower cutter blade 14 for discharge work and bagging work, and a closing member (not shown) is placed in the cut grass carrying passage 32 (see FIG. 4 ) to perform an operation.
- FIG. 6 is a sectional view of the clutch mechanism 40 shown in FIG. 2 .
- the clutch mechanism (clutch/brake mechanism) 40 is made up of an input hub (drive-side hub) 41 mounted on the engine output shaft 28 ; an output hub (driven-side hub) 42 , contactable with and partible from the input hub 41 and having the cutter blade 14 mounted to it; a friction plate 43 , interposed between the input hub 41 and the output hub 42 , that moves up and down along the axis of the output shaft 28 ; a plate spring 44 , interposed between this friction plate 43 and the output hub 42 , for urging the friction plate 43 toward the input hub 41 ; a brake plate 45 for separating and contacting the friction plate 43 and the input hub 41 and stopping the rotation of the friction plate 43 and the input hub 41 ; and a control plate 46 for raising and lowering the brake plate 45 .
- the clutch mechanism 40 has a clutch function for connecting or cutting off the rotation of the engine 13 to/from the cutter blade 14 and a brake function for allowing or stopping rotation of the cutter blade 14 .
- One end of a cable 47 is connected to the control plate 46 , the other end of the cable 47 is connected to the clutch lever 25 via the lock mechanism 60 as shown in FIG. 2 , and the clutch mechanism 40 is thereby remotely controlled.
- the reference number 51 denotes a coil spring attached to the control plate 46 ; 52 a pulley, attached to the output shaft 28 , for transmitting rotation of the engine 13 to the rear wheels 17 , 17 (see FIG. 3 ) via the motive power transmitting part 29 (see FIG. 4 ); 53 a bearing interposed between the output shaft 28 and the input hub 41 ; 54 a bearing interposed between the output hub 42 side and the control plate 46 /brake plate 45 ; 55 bolts for fixing the cutter blade 14 to the output hub 42 ; and 56 a bolt for fixing the input hub 41 and the bearings 53 , 54 en bloc to the output shaft 28 .
- FIG. 7A and FIG. 7B illustrate the operation of the clutch mechanism 40 shown in FIG. 6 , FIG. 7A showing a clutch-disengaged state and FIG. 7B showing a clutch-engaged state.
- FIG. 8 shows the lower cutter blade 14 shown in FIG. 5 .
- the lower cutter blade 14 is used for the bagging mode and the discharge mode (see FIG. 5 ).
- the lower cutter blade 14 has blade edge parts 38 , 38 (hereinafter called the lower blade edges 38 , 38 ), for cutting grass, formed at the leading edges in the rotation direction of end parts of a lower blade proper 111 , and air-lifting parts 39 , 39 formed behind these lower blade edges 38 , 38 for creating a swirl current and a lift current.
- a bolt-accommodating recess 114 and a bolt-accommodating hole 115 for accommodating the head of the bolt 56 (see FIG. 6 ) are formed in the center of the lower blade proper 111 .
- the lower cutter blade 14 is attached to the output hub 42 of the clutch mechanism 40 by the bolts 55 , 55 as shown in FIG. 6 through fixing holes 116 , 116 formed in the lower blade proper 111 .
- the air-lifting parts 39 have multiple protrusions 118 and depressions 119 in the form of a wave formed in their trailing edges 117 to make the swirl currents and lift currents orderly which are created by the air-lifting parts 39 , and multiple long holes 109 formed to relieve the negative pressure arising on the underside of the air-lifting parts 39 , 39 .
- the swirl currents and lift currents created by the air-lifting parts 39 are made orderly and the grass is made to stand up so that it is easy to cut.
- FIG. 9 shows the upper cutter blade 15 shown in FIG. 5 .
- the upper cutter blade 15 is used together with the lower cutter blade 14 for the mulching mode explained with reference to FIG. 5 .
- the upper cutter blade 15 has upper blade edges 122 , 122 , for cutting grass, formed at the leading edges in the rotation direction of end parts of an upper blade proper 121 , and straight clearance parts 123 , 123 formed by the blade width tapering toward the ends behind these upper blade edges 122 , 122 to avoid interference with the air-lifting parts 39 , 39 (see FIG. 8 ).
- a bolt-accommodation hole 125 for accommodation the head of the bolt 56 (see FIG. 6 ) is formed in the center of the upper blade proper 121 .
- the upper cutter blade 15 is co-fastened with the lower cutter blade 14 to the output hub 42 of the clutch mechanism 40 by the bolts 55 , 55 (see FIG. 6 ) passing through circular-arc-shaped holes 126 , 126 formed in the upper blade proper 121 .
- the circular-arc-shaped holes 126 , 126 make it possible to adjust the mounting angle of the upper blade proper 121 , so that the mounting angle of the upper cutter blade 15 with respect to the lower cutter blade 14 (see FIG. 8 ) can be adjusted.
- FIG. 10 shows the mounted state of the upper and lower cutter blades.
- the upper and lower cutter blades 15 , 14 are attached to the output shaft 28 so that with respect to the lower blade edges 38 the upper blade edges 122 are positioned forward in the rotation direction of the cutter blades 14 , 15 . That is, the upper blade edges 122 are disposed with their phase advanced forward with respect to the lower blade edges 38 .
- the clearance parts 123 , 123 of the upper cutter blade 15 are set to a range (overlapping position) such that in plan view they intersect with the lower blade edges 38 , 38 of the lower cutter blade 14 .
- the clearance parts 123 are parts for avoiding obstruction of the swirl current creation function of the air-lifting parts 39 , and when the range over which the cutter blades 14 , 15 intersect is set unnecessarily large, the unity of the upper cutter blade 15 and the lower cutter blade 14 is low and rotation noise increases. Accordingly, by the clearance parts 123 , 123 and the lower blade edges 38 , 38 being set to intersect as mentioned above, increasing of rotation noise can be suppressed.
- the upper blade edges 122 , 122 of the upper cutter blade 15 being disposed to shift with respect to the lower blade edges 38 , 38 of the lower cutter blade 14 , first the grass is cut with the upper cutter blade 15 and then the remaining grass is cut with the lower blade edges 38 , 38 of the lower cutter blade 14 . And also, any uncut grass still remaining is returned to the vertical by the negative pressure arising on the undersides of the air-lifting parts 39 , 39 . As a result, the lawn surface can be evenly cut to a predetermined height.
- FIG. 11 shows the upper and lower cutter blades 15 , 14 mounted to the clutch mechanism 40 .
- the upper cutter blade 15 is set to approximately the same height as the trailing edges 117 of the air-lifting parts 39 , 39 . Consequently, as well as interference with the lower cutter blade 14 being avoided, the height dimension of the cutter housing 12 is kept to a minimum and the gravity position of the lawn mower 10 (see FIG. 5 ) can be maintained as noise is reduced.
- FIG. 12 shows a graph of noise level vs. phase angle ⁇ of the blade edges 122 , 38 of the upper and lower cutter blades 15 , 14 . It can be seen from this graph that as the phase angle ⁇ of the blade edges 122 , 38 changes, the noise level also changes.
- the noise level range E shows the noise level when the speed of the upper and lower cutter blades 15 , 14 has been set to 2,750 rpm
- the noise level F shows the noise level when the speed of the upper and lower cutter blades 15 , 14 has been set to 2,850 rpm.
- the noise reduction effect differs according to the speed of the cutter blades 14 , 15
- the phase angle ⁇ starts at 0° and continues as far as 20°
- the phase angle ⁇ is preferably 5 to 20°.
- the noise level is at a minimum when the phase angle ⁇ is about 12° to 13°, it is more preferably set in the range 10 to 15°.
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Abstract
A lawn mower having upper and lower cutter blades in a cutter housing is provided. The blades are disposed with a phase difference such that upper blade edge parts of the upper cutter blade are advanced forward with respect to lower blade edges of the lower cutter blade in the rotation direction, whereby interference of the upper cutter blade with the air-lifting parts of the lower cutter blade is avoided, and the noise produced by the rotation of the upper and lower cutter blades is reduced.
Description
- This invention relates to a lawn mower having two cutter blades in a cutter housing.
- As working modes of a lawn mower, basically there are the three working modes of mulching work, bagging work, and discharge work.
- Mulching work is a working mode in which two cutter blades are provided in a cutter housing, grass is cut with these cutter blades, and finely cut grass cuttings are dispersed on the lawn surface after cutting so that they are inconspicuous.
- Bagging work is a working mode in which one cutter blade is provided in the cutter housing, grass is cut with this cutter blade, and the cut grass is received in a grass bag attached to the back of the cutter housing.
- Discharge work is a working mode in which one cutter blade is provided in the cutter housing, grass is cut with this cutter blade, and the cut grass is discharged onto the mown lawn surface from the rear of the cutter housing.
- A lawn mower made to perform mulching work is proposed in for example Japanese Utility Model Registration No. 2516509.
- The lawn mower disclosed in this Japanese Utility Model Registration No. 2516509 will be described below on the basis of
FIG. 13 andFIG. 14 hereof. - The
lawn mower 240 of related art shown inFIG. 13 has amotive power source 242 mounted on the top of acutter housing 241. Anupper cutter blade 245 for mulching work only and alower cutter blade 244 for bagging work and discharge work are attached one above the other to theoutput shaft 243 of themotive power source 242. Thelower cutter blade 244 and theupper cutter blade 245 are rotated inside thecutter housing 241 and cut grass. - As shown in
FIG. 14 , in plan view theupper cutter blade 245 is parallel with and stacked on thelower cutter blade 244. However, theupper cutter blade 245 is positioned close to air-liftingparts lower cutter blade 244. Consequently, there has been the shortcoming that as a result of a swirl current and lift current creation function of the air-lifting parts cutter housing 241, being obstructed, as shown inFIG. 13 , the airflows in the vicinities of the air-lifting parts - That is, as shown in
FIG. 13 , because the air-lifting parts lower cutter blade 244 extend above the blade edges of theupper cutter blade 245, the path of the carrying draft is narrowed by the air-lifting parts - Also, as shown in
FIG. 14 , the phases of theblade edges lower cutter blade 244 and theblade edges upper cutter blade 245 overlap. Because of this, it sometimes happens that when grass is cut by theupper cutter blade 245, this grass is pushed over (made to lean) in front of theblade edges blade edges lower cutter blade 244, and the grass cannot be cut with certainty by thelower cutter blade 244. - Accordingly, a lawn mower has been awaited with which it is possible to avoid interference between the lower cutter blade and the upper cutter blade and reduce the noise of these cutter blades.
- The present invention provides a lawn mower having a cutter housing, a motive power source mounted on top of the cutter housing, a lower cutter blade attached rotatably inside the cutter housing and substantially horizontally to the end of the output shaft of the motive power source, and an upper cutter blade attached rotatably inside the cutter housing and substantially horizontally to the output shaft above the lower cutter blade, wherein the lower cutter blade has lower blade edge parts formed at its leading edges in the rotation direction for cutting grass and air-lifting parts for creating a swirl current and a lift current formed behind these lower blade edge parts, the upper cutter blade has upper blade edge parts formed at its leading edges in the rotation direction for cutting grass, and the upper blade edge parts are advanced in phase so that they are positioned forward in the rotation direction with respect to the lower blade edge parts.
- Because the upper and lower cutter blades are attached to the output shaft so that the upper blade edge parts are positioned forward of the lower blade edge parts in the rotation direction like this, interference of the upper cutter blade with the air-lifting parts of the lower cutter blade is avoided, and impairment of the swirl current and lift current creation function of the air-lifting parts is prevented. As a result, the noise produced by the rotation of the cutter blades is reduced.
- Preferably, the rear edges of the air-lifting parts are formed wavily. In this case, the swirl current and lift current created by the air-lifting parts are made orderly and the grass can be held in an upright state so that it is easy to cut.
- In a preferred form, the upper cutter blade is set to approximately the same height as the rear edges of the air-lifting parts. In this case, interference with the lower cutter blade can be avoided and the height dimension of the cutter housing can be kept to a minimum. As a result, the center of gravity position of the lawn mower can be maintained as noise is reduced.
- Certain preferred embodiments of the present invention will be described in detail below, by way of example only, with reference to the accompanying drawings, in which:
-
FIG. 1 is a perspective view of a lawn mower using upper and lower cutter blades according to the invention; -
FIG. 2 is a side view ofFIG. 1 ; -
FIG. 3 is a plan view ofFIG. 1 ; -
FIG. 4 is a view in the direction of the arrow 4 inFIG. 1 ; -
FIG. 5 is a side view showing a mulching work state of the lawn mower shown inFIG. 1 ; -
FIG. 6 is a sectional view of a clutch mechanism shown inFIG. 2 ; -
FIG. 7A andFIG. 7B are views illustrating the operation of the clutch mechanism shown inFIG. 6 ; -
FIG. 8 is a plan view of a lower cutter blade according to the invention shown inFIG. 5 ; -
FIG. 9 is a plan view of an upper cutter blade according to the invention shown inFIG. 5 ; -
FIG. 10 is a plan view showing the upper and lower cutter blades shown inFIG. 8 andFIG. 9 in their mounted state; -
FIG. 11 is a partially sectional view of the upper and lower cutter blades mounted to the clutch mechanism; -
FIG. 12 is a graph showing changes in noise level with changes in phase angle of upper and lower cutter blades according to the invention; -
FIG. 13 is a view showing part of a lawn mower of related art having upper and lower cutter blades; and -
FIG. 14 is a plan view of the upper and lower cutter blades of related art shown inFIG. 13 . - A
lawn mower 10 constituting a preferred embodiment of the invention shown inFIG. 1 is of a self-propelling type. Acutter blade 14 for cutting grass is rotated by anengine 13, which is a motive power source. Cut grass is collected by being carried from acutter housing 12 by a carrying draft into agrass bag 24.Rear wheels 17 are driven by theengine 13. - In the figure, the
reference number 11 denotes a machine body; 16 front wheels; 18 handle stays; 19 a handle; 21 a handle cover extending across thehandle 19; 22 a clutch lever for travel, which clutch-controls motive power transmission from theengine 13 to therear wheels 17; 23 a grass cover; 25 a clutch lever for clutch-controlling rotational power to thecutter blade 14; 26 a lock lever; 27 a head cover; and 60 a lock mechanism. - The
clutch lever 25 is a lever that simultaneously performs an operation of applying a brake to thecutter blade 14 while stopping the driving of thecutter blade 14, and is sometimes called a BBC control lever because it controls a blade, a brake and a clutch. - As shown in
FIG. 2 , theengine 13 of thelawn mower 10 is mounted on the top of thecutter housing 12. Thecutter blade 14 is attached to theoutput shaft 28 of theengine 13 by way of aclutch mechanism 40. The left and rightfront wheels 16 are disposed at side faces of the front part of thecutter housing 12, and the left and rightrear wheels 17 are disposed at side faces of the rear part of thecutter housing 12. Left and right handle stays 18 are attached to the side faces of the rear part of thecutter housing 12. Thehandle 19 extends rearward from the rear parts of these handle stays 18, 18. Theclutch lever 25 is mounted on thishandle 19 and controls theclutch mechanism 40. Thelock lever 26 is mounted in front of theclutch lever 25 and bars an engaging function of the clutch lever. Thegrass bag 24 is removably attached to arear wall 31 of thecutter housing 12. Agrass cover 23 is swingably attached to an upper part of therear wall 31 of thecutter housing 12. - The
grass bag 24 is made of a porous material having plural air holes (not shown) through which only the carrying draft can pass but grass cuttings cannot pass. - As shown in
FIG. 3 , with the engine 13 (seeFIG. 2 ) started, theclutch mechanism 40 of the lawn mower 10 (seeFIG. 2 ) is switched from an off state to an engaged state by a two-stage motion of shifting theclutch lever 25 to thehandle 19 side and then shifting thelock lever 26 forward, to rotate thecutter blade 14, and the clutch lever fortravel 22 is shifted to thehandle 19 side to rotate therear wheels - The
cutter blade 14 hasblade parts blade parts parts - That is, as the
cutter blade 14 rotates, grass on the ground surface is caused to stand up by a negative pressure arising on the undersides of the air-liftingparts blade parts parts cutter blade 14, and with this swirling airflow as a carrying draft the grass cuttings are fed together with the carrying draft through a cutgrass carrying passage 32 into thegrass bag 24 as shown by the arrow B. -
FIG. 4 shows the underside of thelawn mower 10. - The
cutter blade 14 is covered by thecutter housing 12. The cutgrass carrying passage 32 for guiding cut grass into the grass bag 24 (seeFIG. 2 ) is formed in thecutter housing 12. This cutgrass carrying passage 32 connects with thegrass bag 24. - The
reference number 29 denotes a power-transmitting part (a belt); 33 a scroll part provided in thecutter housing 12 for rotatably receiving thecutter blade 14; 52 a drive pulley; 34 a clutch for travel; and 35 a rear wheel axle. - In the
lawn mower 10, the output of theengine 13 is transmitted from thedrive pulley 52 of theoutput shaft 28 to a drivenpulley 29 a by thebelt 29, and by way of the drivenpulley 29 a and the clutch fortravel 34 the output of theengine 13 is transmitted to therear wheel axle 35 and drives therear wheels 17, 17 (seeFIG. 3 ). -
FIG. 5 shows a mulching work state of the lawn mower. Mulching work (mulching mode) is a working mode in which two cutter blades are provided in the cutter housing, grass is cut with these cutter blades, and finely cut grass cuttings are dispersed on the lawn surface (ground surface) so that they are inconspicuous. Mulching work is an alternative mode of discharge work, discussed below. - Discharge work (discharge mode) is a working mode in which grass is cut with one cutter blade, and the cut grass is made to pass through the cut grass carrying passage and discharged outside through the grass cover.
- Bagging work (bagging mode) is a working mode in which grass is cut with one cutter blade and the cut grass is made to pass through the cut grass carrying passage and collected in the grass bag.
- That is, the
lawn mower 10 of this preferred embodiment is capable of mulching work, discharge work and bagging work (seeFIG. 2 ). When mulching work is to be done, anupper cutter blade 15 for mulching work is fitted to theoutput shaft 28 of theengine 13 along with alower cutter blade 14 for discharge work and bagging work, and a closing member (not shown) is placed in the cut grass carrying passage 32 (seeFIG. 4 ) to perform an operation. -
FIG. 6 is a sectional view of theclutch mechanism 40 shown inFIG. 2 . - The clutch mechanism (clutch/brake mechanism) 40 is made up of an input hub (drive-side hub) 41 mounted on the
engine output shaft 28; an output hub (driven-side hub) 42, contactable with and partible from theinput hub 41 and having thecutter blade 14 mounted to it; afriction plate 43, interposed between theinput hub 41 and theoutput hub 42, that moves up and down along the axis of theoutput shaft 28; aplate spring 44, interposed between thisfriction plate 43 and theoutput hub 42, for urging thefriction plate 43 toward theinput hub 41; abrake plate 45 for separating and contacting thefriction plate 43 and theinput hub 41 and stopping the rotation of thefriction plate 43 and theinput hub 41; and acontrol plate 46 for raising and lowering thebrake plate 45. - That is, the
clutch mechanism 40 has a clutch function for connecting or cutting off the rotation of theengine 13 to/from thecutter blade 14 and a brake function for allowing or stopping rotation of thecutter blade 14. - One end of a
cable 47 is connected to thecontrol plate 46, the other end of thecable 47 is connected to theclutch lever 25 via thelock mechanism 60 as shown inFIG. 2 , and theclutch mechanism 40 is thereby remotely controlled. - In
FIG. 6 , thereference number 51 denotes a coil spring attached to thecontrol plate 46; 52 a pulley, attached to theoutput shaft 28, for transmitting rotation of theengine 13 to therear wheels 17, 17 (seeFIG. 3 ) via the motive power transmitting part 29 (seeFIG. 4 ); 53 a bearing interposed between theoutput shaft 28 and theinput hub 41; 54 a bearing interposed between theoutput hub 42 side and thecontrol plate 46/brake plate 45; 55 bolts for fixing thecutter blade 14 to theoutput hub 42; and 56 a bolt for fixing theinput hub 41 and thebearings output shaft 28. -
FIG. 7A andFIG. 7B illustrate the operation of theclutch mechanism 40 shown inFIG. 6 ,FIG. 7A showing a clutch-disengaged state andFIG. 7B showing a clutch-engaged state. - In
FIG. 7A , by thecable 47 being let out as shown by the arrow a1, thefriction plate 43 is pushed by thebrake plate 45, thisfriction plate 43, theplate spring 44 and theoutput hub 42 are stopped and a brake is applied to thecutter blade 14, and a space S1 is created between thefriction plate 43 and theinput hub 41 so that theoutput hub 42 is isolated from theinput hub 41. - In
FIG. 7B , by thecable 47 being pulled as shown by the arrow a2, thebrake plate 45 is released from thefriction plate 43, a space S2 is created between thefriction plate 43 and thebrake plate 45, and thefriction plate 43 is engaged with theinput hub 41 and the rotation of theoutput shaft 28 is transmitted in order from theinput hub 41 to thefriction plate 43, theplate spring 44, theoutput hub 42 and thecutter blade 14. -
FIG. 8 shows thelower cutter blade 14 shown inFIG. 5 . Thelower cutter blade 14 is used for the bagging mode and the discharge mode (seeFIG. 5 ). - The
lower cutter blade 14 hasblade edge parts 38, 38 (hereinafter called the lower blade edges 38, 38), for cutting grass, formed at the leading edges in the rotation direction of end parts of a lower blade proper 111, and air-liftingparts - A bolt-accommodating
recess 114 and a bolt-accommodatinghole 115 for accommodating the head of the bolt 56 (seeFIG. 6 ) are formed in the center of the lower blade proper 111. Thelower cutter blade 14 is attached to theoutput hub 42 of theclutch mechanism 40 by thebolts FIG. 6 through fixingholes - The air-lifting
parts 39 havemultiple protrusions 118 anddepressions 119 in the form of a wave formed in theirtrailing edges 117 to make the swirl currents and lift currents orderly which are created by the air-liftingparts 39, and multiplelong holes 109 formed to relieve the negative pressure arising on the underside of the air-liftingparts - By the trailing
edges 117 of the air-liftingparts 39 each being formed in a wave shape, the swirl currents and lift currents created by the air-liftingparts 39 are made orderly and the grass is made to stand up so that it is easy to cut. - By the multiple
long holes 109 being formed in the air-liftingparts 39, the occurrence of eddy currents arising due to the negative pressure on the undersides of the air-liftingparts -
FIG. 9 shows theupper cutter blade 15 shown inFIG. 5 . Theupper cutter blade 15 is used together with thelower cutter blade 14 for the mulching mode explained with reference toFIG. 5 . - The
upper cutter blade 15 has upper blade edges 122, 122, for cutting grass, formed at the leading edges in the rotation direction of end parts of an upper blade proper 121, andstraight clearance parts parts 39, 39 (seeFIG. 8 ). - A bolt-
accommodation hole 125 for accommodation the head of the bolt 56 (seeFIG. 6 ) is formed in the center of the upper blade proper 121. Theupper cutter blade 15 is co-fastened with thelower cutter blade 14 to theoutput hub 42 of theclutch mechanism 40 by thebolts 55, 55 (seeFIG. 6 ) passing through circular-arc-shapedholes holes upper cutter blade 15 with respect to the lower cutter blade 14 (seeFIG. 8 ) can be adjusted. -
FIG. 10 shows the mounted state of the upper and lower cutter blades. Referring toFIG. 10 , the upper andlower cutter blades output shaft 28 so that with respect to the lower blade edges 38 the upper blade edges 122 are positioned forward in the rotation direction of thecutter blades - Consequently, interference of the
upper cutter blade 15 with the air-liftingparts 39 of thelower cutter blade 14 is avoided, and impairment of the swirl current and lift current creation function of the air-liftingparts 39 is prevented. As a result, reduction of the noise of thecutter blades - The
clearance parts upper cutter blade 15 are set to a range (overlapping position) such that in plan view they intersect with the lower blade edges 38, 38 of thelower cutter blade 14. Theclearance parts 123 are parts for avoiding obstruction of the swirl current creation function of the air-liftingparts 39, and when the range over which thecutter blades upper cutter blade 15 and thelower cutter blade 14 is low and rotation noise increases. Accordingly, by theclearance parts - When the phase of the lower blade edges 38, 38 of the
lower cutter blade 14 and the upper blade edges 122, 122 of theupper cutter blade 15 is small, when grass is cut by theupper cutter blade 15, this grass is pushed over forward so as to lean by the upper blade edges 122, 122. And when the lower blade edges 38, 38 of thelower cutter blade 14 cut this leaned grass, thelower cutter blade 14 cannot certainly cut the grass. - Accordingly, by the upper blade edges 122, 122 of the
upper cutter blade 15 being disposed to shift with respect to the lower blade edges 38, 38 of thelower cutter blade 14, first the grass is cut with theupper cutter blade 15 and then the remaining grass is cut with the lower blade edges 38, 38 of thelower cutter blade 14. And also, any uncut grass still remaining is returned to the vertical by the negative pressure arising on the undersides of the air-liftingparts -
FIG. 11 shows the upper andlower cutter blades clutch mechanism 40. - The
upper cutter blade 15 is set to approximately the same height as the trailingedges 117 of the air-liftingparts lower cutter blade 14 being avoided, the height dimension of thecutter housing 12 is kept to a minimum and the gravity position of the lawn mower 10 (seeFIG. 5 ) can be maintained as noise is reduced. -
FIG. 12 shows a graph of noise level vs. phase angle θ of the blade edges 122, 38 of the upper andlower cutter blades - The noise level range E shows the noise level when the speed of the upper and
lower cutter blades lower cutter blades cutter blades range 10 to 15°. - For example, because when the phase angle of the upper blade edges 122 with respect to the lower blade edges 38 is small the
upper cutter blade 15 interferes with thelower cutter blade 14, the noise of the rotation of thesecutter blades lower cutter blades lower cutter blades - Although in the foregoing preferred embodiment an example was shown in which
straight clearance parts upper cutter blade 15 as shown inFIG. 10 , the invention is not limited to this, and alternatively the clearance parts may be curved or wavy. - Obviously, various minor changes and modifications of the present invention are possible in the light of the above teaching. It is therefore to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.
Claims (3)
1. A lawn mower comprising:
a cutter housing;
a motive power source mounted on the cutter housing;
a lower cutter blade attached rotatably inside the cutter housing and substantially horizontally to the end of the output shaft of the motive power source; and
an upper cutter blade attached rotatably inside the cutter housing and substantially horizontally to the output shaft above the lower cutter blade,
wherein the lower cutter blade has lower blade edge parts formed at its leading edges in the rotation direction for cutting grass and air-lifting parts formed behind these lower blade edge parts for creating a swirl current and a lift current,
the upper cutter blade has upper blade edge parts formed at its leading edges in the rotation direction for cutting grass,
and the upper blade edge parts are advanced in phase so that they are positioned forward in the rotation direction with respect to the lower blade edge parts.
2. A lawn mower according to claim 1 , wherein rear edges of the air-lifting parts are formed wavily.
3. A lawn mower according to claim 1 , wherein the upper cutter blade is set approximately at the same height as rear edges of the air-lifting parts.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004255937A JP2006067918A (en) | 2004-09-02 | 2004-09-02 | Lawn mower |
JP2004-255937 | 2004-09-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20060042216A1 true US20060042216A1 (en) | 2006-03-02 |
US7392643B2 US7392643B2 (en) | 2008-07-01 |
Family
ID=35522562
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/216,391 Expired - Fee Related US7392643B2 (en) | 2004-09-02 | 2005-08-31 | Mulching system for a lawn mower |
Country Status (5)
Country | Link |
---|---|
US (1) | US7392643B2 (en) |
EP (1) | EP1637027B1 (en) |
JP (1) | JP2006067918A (en) |
CN (2) | CN2850234Y (en) |
ES (1) | ES2566334T3 (en) |
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US9872431B2 (en) * | 2013-09-20 | 2018-01-23 | Kubota Corporation | Wind-generating mower blade |
WO2018124021A1 (en) | 2016-12-27 | 2018-07-05 | 本田技研工業株式会社 | Cutter blade and lawn mower |
CN110113932A (en) * | 2016-12-27 | 2019-08-09 | 本田技研工业株式会社 | Cutting blade and grass trimmer |
US20210321564A1 (en) * | 2020-04-16 | 2021-10-21 | Nanjing Chervon Industry Co., Ltd. | Lawn mower and blade assembly |
US20220279715A1 (en) * | 2018-09-27 | 2022-09-08 | Nanjing Chervon Industry Co., Ltd. | Blade assembly for a lawn mower |
US11641795B2 (en) | 2018-09-27 | 2023-05-09 | Nanjing Chervon Industry Co., Ltd. | Lawn mower |
USD995569S1 (en) | 2019-04-18 | 2023-08-15 | Nanjing Chervon Industry Co., Ltd. | Mower blade assembly |
USD1013739S1 (en) * | 2022-05-31 | 2024-02-06 | Husqvarna Ab | Lawn mower blade |
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US20070193240A1 (en) * | 2006-02-21 | 2007-08-23 | Dean Nafziger | Cutting assembly with high lift impeller blade and string trimmer combination |
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JP6151659B2 (en) | 2014-03-27 | 2017-06-21 | 本田技研工業株式会社 | Lawn mower |
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CN107302864B (en) * | 2016-04-18 | 2020-05-26 | 南京德朔实业有限公司 | Cutting assembly and lawn mower with same |
US10874051B2 (en) * | 2016-10-31 | 2020-12-29 | Honda Motor Co., Ltd. | Utility vehicle with noise inhibition |
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US10349576B1 (en) | 2018-02-22 | 2019-07-16 | Charles M Jones | Vegetation cutter and mulcher |
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US9872431B2 (en) * | 2013-09-20 | 2018-01-23 | Kubota Corporation | Wind-generating mower blade |
US11490565B2 (en) * | 2016-12-27 | 2022-11-08 | Honda Motor Co., Ltd. | Cutter blade and mower |
WO2018124021A1 (en) | 2016-12-27 | 2018-07-05 | 本田技研工業株式会社 | Cutter blade and lawn mower |
CN110113932A (en) * | 2016-12-27 | 2019-08-09 | 本田技研工业株式会社 | Cutting blade and grass trimmer |
CN110121257A (en) * | 2016-12-27 | 2019-08-13 | 本田技研工业株式会社 | Cutting blade and grass trimmer |
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US11388857B2 (en) * | 2016-12-27 | 2022-07-19 | Honda Motor Co., Ltd. | Cutter blade and lawn mower |
USD995568S1 (en) | 2018-09-27 | 2023-08-15 | Nanjing Chervon Industry Co., Ltd. | Mower blade assembly |
US11917939B2 (en) * | 2018-09-27 | 2024-03-05 | Nanjing Chervon Industry Co., Ltd. | Blade assembly for a lawn mower |
US20220279715A1 (en) * | 2018-09-27 | 2022-09-08 | Nanjing Chervon Industry Co., Ltd. | Blade assembly for a lawn mower |
US11641795B2 (en) | 2018-09-27 | 2023-05-09 | Nanjing Chervon Industry Co., Ltd. | Lawn mower |
USD987691S1 (en) | 2018-09-27 | 2023-05-30 | Nanjing Chervon Industry Co., Ltd. | Mower blade assembly |
US12041874B2 (en) | 2018-09-27 | 2024-07-23 | Nanjing Chervon Industry Co., Ltd. | Blade assembly for a lawn mower |
US11997944B2 (en) | 2018-09-27 | 2024-06-04 | Nanjing Chervon Industry Co., Ltd. | Blade assembly for a lawn mower |
USD995567S1 (en) | 2018-09-27 | 2023-08-15 | Nanjing Chervon Industry Co., Ltd. | Mower blade assembly |
USD996470S1 (en) | 2018-09-27 | 2023-08-22 | Nanjing Chervon Industry Co., Ltd. | Mower blade assembly |
USD996471S1 (en) | 2018-09-27 | 2023-08-22 | Nanjing Chervon Industry Co., Ltd. | Mower blade assembly |
USD997998S1 (en) | 2018-09-27 | 2023-09-05 | Nanjing Chervon Industry Co., Ltd. | Mower blade |
US11937545B2 (en) * | 2018-09-27 | 2024-03-26 | Nanjing Chervon Industry Co., Ltd. | Blade assembly for a lawn mower |
US20220346310A1 (en) * | 2018-09-27 | 2022-11-03 | Nanjing Chervon Industry Co., Ltd. | Blade assembly for a lawn mower |
USD995569S1 (en) | 2019-04-18 | 2023-08-15 | Nanjing Chervon Industry Co., Ltd. | Mower blade assembly |
US11812690B2 (en) * | 2020-04-16 | 2023-11-14 | Nanjing Chervon Industry Co., Ltd. | Lawn mower and blade assembly |
US20210321564A1 (en) * | 2020-04-16 | 2021-10-21 | Nanjing Chervon Industry Co., Ltd. | Lawn mower and blade assembly |
USD1013739S1 (en) * | 2022-05-31 | 2024-02-06 | Husqvarna Ab | Lawn mower blade |
Also Published As
Publication number | Publication date |
---|---|
ES2566334T3 (en) | 2016-04-12 |
US7392643B2 (en) | 2008-07-01 |
EP1637027B1 (en) | 2016-03-09 |
JP2006067918A (en) | 2006-03-16 |
EP1637027A1 (en) | 2006-03-22 |
CN2850234Y (en) | 2006-12-27 |
CN1742539A (en) | 2006-03-08 |
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Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
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Effective date: 20120701 |